She already got wrecked by the fleet at least once (maybe twice I think I dont remember a lot of season 7) and already had gotten shot at by a scorpion from lannister forces who were allied with the iron fleet.
Oh yeah I'm not saying this excuse isn't stupid but it's not like "hur, dur, iron what??" stupid that people are trying to portray.
She was not fighting the dead that that point. They were back on her main mission, and Euron's fleet should have been in the forefront of her thoughts. Jesus.
Not sure how you can honestly apologize for this. It's pretty clear-cut.
Verbatim: "While Dany kind of forgot about the iron fleet and Euron's forces, they haven't forgotten about her."
That clip even highlights just how stupid it was that she ran into them in the first place, temporary alzheimer's or no.
Did you watch the video you linked me? Here's the part before your quote:
"While we've been concentrating on Winterfell and the fight against the army of the dead, Dany's other enemies have not just been sitting still, they've been planning for the final battle. We saw in season 7 that Qyburn had invented this giant dragon killing scorpion and it didn't quite work. Qyburn went back to the drawing board and he made even larger more powerful scorpions. Dozens of them are now lining the walls of King's Landing and dozens more are mounted on the deck of the Iron Fleet."
Right after that he says-
"While Dany kind of forgot about the iron fleet and Euron's forces, they certainly haven't forgotten about her."
It's clear what he's saying is that she didn't consider that they might have mounted scorpions onto the iron fleet. She felt safe flying above the water because it hadn't crossed her mind that Qyburn might have decided to make dozens/hundreds of these things and put them on Euron's ships.
Like I said that's still stupid, but it's a much less offensive level of stupid.